.app{
	width: 100%;
	height: 100vh;
	background-color: #ffffff;
	position: relative;
	display: flex;
	justify-content: center;
	align-items: center;
}
.btn44{
	font-size: 14px;
	font-weight: 700;
	height: 32px;
	line-height: 32px;
	color: #333333;
	text-decoration: none;
	cursor: pointer;
	position: relative;
}
.btn44:after{
	content: '';
	width: 0;
	height: 2px;
	background-color: #333333;
	position: absolute;
	right: 0;
	bottom: 0px;
	transition: width 0.6s;
}
.btn44:hover:after{
  width: 100%;
  left: 0;
}